The document discusses search engine optimization (SEO). It defines SEO as optimizing a website to rank well in search engine results by understanding how search algorithms work. It describes how search engines like Google crawl, index, and rank webpages. It discusses both white hat and black hat SEO techniques, with white hat following search engine guidelines and black hat attempting to manipulate rankings through deception. The document provides tips for SEO, including using relevant keywords in filenames, short and descriptive page titles, and ensuring pages have more text than HTML elements.